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Don

ESP8266 powered web server + LED control + DHT22 temperature/humidity sensor reading

The ESP8266 System-on-chip (SoC) has recently came out of nowhere and has been taking by storm the IoT DIY world. It is a $4.50 Wi-Fi capable chip that has remarkable specs, obsoleting overnight a number of similar products that are out there. The price factor, availability of SDK and a fast growing community make this chip quite attractive.

The most common usage for the chip so far has been to interface it to MCU and utilize the AT commands that are available in the default firmware, however that is quite an abuse of the power under the hood of the ESP8266. I’ve decided not to use external MCU and utilize the chip itself for a proof-of-concept project:

The project shall be able to

Run a HTTP daemon
Be configurable through web interface
Provide web UI for switching on/off a LED connected to GPIO pin
Provide web UI for reading a temperature+humidity sensor (DHT22)

There are few different versions of the breakouts available, most popular is the DIP version . However that version only has GPIO0 and GPIO2 routed to the header, so I also purchased the SMD version that has all the pins available. I have made couple interface strip-board PCBs so that I can interface the modules with a “pure” 3.3V FTDI cable:

Read More...
http://harizanov.com/2014/11/esp8266-powered-web-server-led-control-dht22-temperaturehumidity-sensor-reading/